Because of the difference of geographical and climate zone, the similarities of Dognjiang with other floras have changed, they show the influences of geographical and climate conditions.

• 随着地理纬度和气候带的不同，东江流域与其它地区植物区系相似性系数也发生变化，反映出地理环境条件和气候条件对现代植物分布的影响。